diff --git a/vite/vite-cli.mjs b/vite/vite-cli.mjs
index ee1c5b89..c68cc7cf 100644
--- a/vite/vite-cli.mjs
+++ b/vite/vite-cli.mjs
@@ -37,7 +37,9 @@ if (command === "dev") {
     })
   );
 
-  server.openBrowser();
+  if (options.openBrowser) {
+    server.openBrowser();
+  }
 } else if (command === "build") {
   const resolvedConfig = await resolveConfig(config);
   console.log(
diff --git a/vite/vite.sim.w b/vite/vite.sim.w
index b8bd94bb..83a5e0f1 100644
--- a/vite/vite.sim.w
+++ b/vite/vite.sim.w
@@ -14,6 +14,7 @@ pub class Vite_sim {
     let cliFilename = Vite_sim.cliFilename();
     let homeEnv = util.env("HOME");
     let pathEnv = util.env("PATH");
+    let openBrowser = util.env("WING_IS_TEST") != "true";
 
     new cloud.Service(inflight () => {
       let url = Vite_sim.dev({
@@ -25,6 +26,7 @@ pub class Vite_sim {
         cliFilename: cliFilename,
         homeEnv: homeEnv,
         pathEnv: pathEnv,
+        openBrowser: openBrowser,
       });
       state.set("url", url);
     });